Auto merge of #19760 - emilio:ruby-display-adjust, r=upsuper
Auto merge of #19760 - emilio:ruby-display-adjust, r=upsuper

style: Ruby style adjustments shouldn't reset mOriginalDisplay.

This matches what Gecko does:

  https://searchfox.org/mozilla-central/rev/7476b71e0010ab3277b77cc0ae4d998c4b1d2b64/layout/style/GeckoStyleContext.cpp#992

And it's conceptually more right, since we ideally shouldn't mutate
mOriginalDisplay from StyleAdjuster.

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